Crosshead



P. H. DUNN March 10, 1931.

CROSSHEAD Filed Oct. 12, 1929 wherein:

Patented Mai. 1o, 1931 P A"riiui OFFICE PATRICK ii. DUNN, on iviiLEs CITY, MONTANA CRossHEAD r'Application filed October 1 2, 19.29.1Sei1a1 No. 393,307.

y i The object of the invention is to improve f, theconstruction of crossheads for engines of vthe locomotive'or stationary type by forming the crosshead in such a way that the pis- 5 ton rod may be secured to it by clamping,

thus doing away'witli the conventional wrist n pin connection ;l to provide a crosshead of which the body portion is of skeleton form, so as to be comparatively light and therefore l0 susceptible ofcheap construction; to provide tra vdevice of this character inv which movement over the crosshead guides is had by hieansof roller bearings; to provide a con-V 'struction of thisgeneral character in which 1.5* the connection between the crosshead and the connecting link is hadby Vmeans of a special Vconnection between the linkand the extended j' portion of the Ypiston rod; and to provide meansfor the Veluick'ta'ke-up of any wear be#A L zotweenjthe connecting linkand theconnected portion of the piston rod. y Y VVlitli this object in view the invention consists'in a construction andcombinatioii ofy k; parts of which a preferred embodiment is il- 25 lustrated iii the accompanying drawings,

f, 'Figure l is aside elevational view of the 1 invention, ypartly broken away, and indicating the essential associated parts of an en,-

' Figures 2,3, 4, and 5 are sectionalviews on the planes indicated by the lines 2 2, 3 3,

i i., .-4, and5`5respectively of Figure 1.

i Seekingto do away with the conventional 35 piston key and-(wrist pin connectionsbev tween the piston rod and connecting linksl Vwith the ,ci'osshe-ad,y the crosshead 1() in the present inventionisfvmade-.of skeleton lform having the' outer Aside wallsll and parallel -web'portions1'2,-therlatterof which are j arched at their longitudinal centers, as indicated-aft 14,.so that the piston rod 15 instead 1 krrrof -having terminated at the orosshead exsy Y I tended through the-"latter betweenthe arched 475 portions Connectionbetween the erosshead f andi-the .piston 4rod is effected-by clamping Y 1 action-[of "the arched *portions on Vvthe: web,

construction, freeand easy movement oi' the ci) crossliead over the slides is possiblc,the rollers 2O traversingy the slides and the shafts 19 rotating freely in the bearings '13.

The extended endv of the piston rod is terminated in a b all 22 which may be'foi'medl v as an 'integral part of the piston rod, or as an attached part mechanically secured.v The ball constitutes an element of a uni'from Connection between the'piston rodandtheeoiinectiiig link 23 which will take care of any `ie lacky of lateral alignment between the connecting link and the piston rod, the former being provided with a sleeve 24 mounted to permit relative axial movement between it and the sleeve but to preclude relative angular or turning movement. The forward end of the sleeve 24 is interiorily threaded for the reception on an ext-eriorly threaded split cone ybearing 25 vwhich surrounds the ball 22. 'I he cone bearing 25, when properly seated, is VS0 locked in position by a tangeiitially arranged keyk in the form ofra pin 26 passing through holes in the sleeve and a seat in the ycone bearing. The ball has a thrust bearing in a. conical seat 27 in the end oi'a take-up member 28 which is rotatably mount-ed in the sleeve 2l' and formed with gear teeth on the body portion 29, a. rearwardly extended externally `threaded tail extension 30 being carried by thetake-up member and entering a threaded f" i socket at the forward end of the connecting link.- Disposed inaV tangential bearing in the sleeve 24 is a worm having an interiorly exposed tool seat 32 at one end and carrying;

lock nut 33. The worm meshes with the i c teeth of the take-upmember 28 and, when thevloek nut 33 is released maybe rotated by a tool applied to the seat 32.l The take-up member, under such conditions will berotated and relative movement between it incl-fi@` the Connecting iod 'effected to take up any lost motionexisting, sincethe take-np'member v,is f

l'otatably-'mountedin the Sleeve hut. pre- Y eluded from axial movement with respect to'V 5 the latter. The position of the sleeve with respect-tothe connectedjend ofV the, piston llrodbeings fixed vby the `seating-of*theV cone K I 'bearing-Q25', the operation ofthe take-up 128 Will serve to takenp any lost motion between Y 10 .the 'connecting link and the rod 'esnltin'g "from Weaiforotherwise. 1 Y l? Theinventon having beendescribed what isclained asnen7 and useful is:V r .Y YlfAn engine crosshead 'of skeletonuconl f5 struction and having 'spaced' p'aiallel outer" walls, and an,interyeninggweh,panalleling .Y v Y. l Y. f

i eaicloutenwalls andarclied atthe centelfor' v, A Y f [disposition in sulronnding relation @to a M- L piston 1nd,;Y and` clamping-bolts extendingY f ,Y 20'transverselythrough.thecosshead for etfectfr i bindingtengagemient `of the arched-.portions .e Vfi'ofthe web onsad rod.'V Y -V n An 'engine crossheadfgof skeleton .con- Y struction and having spaced parallel side Y 25 Walls Yand Web rplates' disposed between said t Walls*:andgparalleling the` sanne,l said. webA A plates beingtranswersely arched along lone t vgitudnalcenter line, "clamping boltsextend 1 -ngfthioughlthecrosshead above and below -v Y N30 thearched Vportionsof'thezweloplatesi and;l L i ISpacers throughawhich :saidbolts extend, the fj spacers being disposedbetween the side Walls g @andthe-web plates. y l l I -.j.lnljftestilnony`whereof heaixes hisv signatiuG-z riem fi f 

